I am due my first review with the ccsva. They have written asking for 3mths payslips, my latest P60, a budget review and 3mths bank statements. It didnt mention bank statements in the initial paperwork so i havent kept them. Is it esential?

I am in an IVA through the ccsva and i am confused as to what to do with my expenses. I have to pay upfront and claim my work expenses back. Does this affect my iva and do i need to keep records of them all? I do not want to have to explain my financial situation to my employer